Thermal spray powders for wear-resistant coatings, and related methods
a technology of wear-resistant coating and spray powder, which is applied in the direction of solid-state diffusion coating, plasma technique, inorganic chemistry, etc., can solve the problems of high solid lubricant content, high “loading”, and have proved to be challenging, and achieve uniform solid lubricant dispersion and high solid lubricant loading
Inactive Publication Date: 2008-06-19
GENERAL ELECTRIC CO
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Benefits of technology
[0003]The present invention meets these and other needs by providing a wear-resistant coating with substantially high solid lubricant loading and uniform solid lubricant dispersion. Accordingly, one embodiment of the invention is a method of making a thermal spray powder. The method comprises: providing a powder comprising a plurality of porous particles; infiltrating a mixture comprising a solvent and a plurality of solid lubricant particles into the porous particles, and heating the powder to a temperature sufficient to evaporate the solvent.
Problems solved by technology
However, obtaining a wear-resistant coating with a substantially uniform dispersion of solid lubricants, and with high “loading” i.e. high solid lubricant content, has proven to be challenging.
Method used
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Tungsten Carbide Based Powders Infiltrated with Hexagonal Boron Nitride Particles
[0058]200 mL of WC / Co powder was mixed with 200 mL of boron nitride in suspension, and 20 mL of hot water. Three types of Nanomyte® powders were mixed with boron nitride in separate jars. Powder A: WC / 8Co4Cr, Powder B: WC / 12Co, and Powder C: WC / 9Co. The mixture was put in vacuum furnace at a temperature of 100° C. at −30″ Hg (−1.0 bar). The mixture was left overnight. The resulting material was in a dry and hard (non-powder) form. The powder was mechanically crushed to return it to powder form. (Nanomyte® is a product of NEI. Liquid boron nitride is a product of Montreal Carbides.) The powders were thermally sprayed onto a substrate, by feeding the powder into a “standard” HVOF (High Velocity Oxygen Fuel, with the fuel being Hydrogen) process. The HVOF process we used was the Sulzer Metco Diamond Jet system. Microscopy and X-ray photoelectron microscopy (XPS) measurements were performed on a Kratos Axis...
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Abstract
A method of making a thermal spray powder is provided. The method comprises: providing a powder comprising a plurality of porous particles; infiltrating a mixture comprising a solvent and a plurality of solid lubricant particles into the porous particles; and heating the powder to a temperature sufficient to evaporate the solvent. The method of forming a wear-resistant coating is provided. The method comprises: providing a thermal spray powder; heating the thermal spray powder; and accelerating the thermal spray powder from a thermal spray gun onto the substrate, to form a deposit. Yet another embodiment provides a wear resistant coating. The wear resistant coating is formed by thermally spraying the thermal spray powder.
Description
BACKGROUND[0001]The invention relates generally to thermal spray powders. More specifically, the invention relates to thermal spray powders comprising solid lubricants, and to methods of forming thermal spray powders and coatings.[0002]Wear-resistant coatings are used extensively in many applications where sliding or fretting wear with limited or no amount of lubricant is present. These applications include cutting tools, automotive parts, and turbine parts. Wear-resistant coatings including solid lubricants dispersed in a suitable matrix have proven to be efficient under a variety of operational conditions, including high temperatures, low humidity, and so forth. However, obtaining a wear-resistant coating with a substantially uniform dispersion of solid lubricants, and with high “loading” i.e. high solid lubricant content, has proven to be challenging. In spite of much effort, there is a need for wear-resistant coatings with high solid lubricant loading and uniform dispersion, and...
Claims
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IPC IPC(8): B05D1/10C10M125/02C10M125/04C10M125/08C10M125/18C10M125/20C10M125/00C10M129/24C10M129/04B22F1/10B22F1/142
CPCB22F1/0059C23C24/04B22F2998/10B22F2999/00C10M103/02C10M103/04C10M103/06C10M107/38C10M2201/0413C10M2201/0613C10M2201/0653C10M2201/0663C10M2201/0803C10M2201/0873C10M2213/0623C10N2210/02C10N2220/082C10N2230/06C10N2250/04C23C4/04C23C4/06C23C4/10C23C10/18B22F1/0085C23C4/18C23C4/00B22F2201/20C10N2020/06C10N2030/06C10N2010/04C10N2050/04B22F1/10B22F1/142
Inventor GHASRIPOOR, FARSHADCURTIS, TODD CHARLESGRAY, DENNIS MICHAEL
Owner GENERAL ELECTRIC CO
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